SECRETS OF OPENING SURPRISES brings you a wide variety of unusual opening ideas. They may seem outrageous at first sight, but have proven to be perfectly playable. An SOS deviates very early from the regular lines in a mainstream opening, usually even before move six. That is why it is so easy to actually bring the variation on the board. With an SOS you will baffle your opponent, gain crucial time and stand a good chance to get an advantage WITHOUT having studied large quantities of stuffy theory